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pool.rs
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pool.rs
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use bytes::Bytes;
use std::collections::{HashMap, HashSet};
use std::sync::mpsc::{Receiver, TryRecvError};
use std::sync::{Arc, Mutex};
use std::time::Duration;
use tokio::time::Instant;
use crate::error::{BoxError, Error, Kind};
use crate::Body;
use bytes::Buf;
use futures_util::future;
use h3::client::SendRequest;
use h3_quinn::{Connection, OpenStreams};
use http::uri::{Authority, Scheme};
use http::{Request, Response, Uri};
use hyper::Body as HyperBody;
use log::trace;
pub(super) type Key = (Scheme, Authority);
#[derive(Clone)]
pub struct Pool {
inner: Arc<Mutex<PoolInner>>,
}
impl Pool {
pub fn new(timeout: Option<Duration>) -> Self {
Self {
inner: Arc::new(Mutex::new(PoolInner {
connecting: HashSet::new(),
idle_conns: HashMap::new(),
timeout,
})),
}
}
pub fn connecting(&self, key: Key) -> Result<(), BoxError> {
let mut inner = self.inner.lock().unwrap();
if !inner.connecting.insert(key.clone()) {
return Err(format!("HTTP/3 connecting already in progress for {:?}", key).into());
}
return Ok(());
}
pub fn try_pool(&self, key: &Key) -> Option<PoolClient> {
let mut inner = self.inner.lock().unwrap();
let timeout = inner.timeout;
if let Some(conn) = inner.idle_conns.get(&key) {
// We check first if the connection still valid
// and if not, we remove it from the pool.
if conn.is_invalid() {
trace!("pooled HTTP/3 connection is invalid so removing it...");
inner.idle_conns.remove(&key);
return None;
}
if let Some(duration) = timeout {
if Instant::now().saturating_duration_since(conn.idle_timeout) > duration {
trace!("pooled connection expired");
return None;
}
}
}
inner
.idle_conns
.get_mut(&key)
.and_then(|conn| Some(conn.pool()))
}
pub fn new_connection(
&mut self,
key: Key,
mut driver: h3::client::Connection<Connection, Bytes>,
tx: SendRequest<OpenStreams, Bytes>,
) -> PoolClient {
let (close_tx, close_rx) = std::sync::mpsc::channel();
tokio::spawn(async move {
if let Err(e) = future::poll_fn(|cx| driver.poll_close(cx)).await {
trace!("poll_close returned error {:?}", e);
close_tx.send(e).ok();
}
});
let mut inner = self.inner.lock().unwrap();
let client = PoolClient::new(tx);
let conn = PoolConnection::new(client.clone(), close_rx);
inner.insert(key.clone(), conn);
// We clean up "connecting" here so we don't have to acquire the lock again.
let existed = inner.connecting.remove(&key);
debug_assert!(existed, "key not in connecting set");
client
}
}
struct PoolInner {
connecting: HashSet<Key>,
idle_conns: HashMap<Key, PoolConnection>,
timeout: Option<Duration>,
}
impl PoolInner {
fn insert(&mut self, key: Key, conn: PoolConnection) {
if self.idle_conns.contains_key(&key) {
trace!("connection already exists for key {:?}", key);
}
self.idle_conns.insert(key, conn);
}
}
#[derive(Clone)]
pub struct PoolClient {
inner: SendRequest<OpenStreams, Bytes>,
}
impl PoolClient {
pub fn new(tx: SendRequest<OpenStreams, Bytes>) -> Self {
Self { inner: tx }
}
pub async fn send_request(
&mut self,
req: Request<Body>,
) -> Result<Response<HyperBody>, BoxError> {
let (head, req_body) = req.into_parts();
let req = Request::from_parts(head, ());
let mut stream = self.inner.send_request(req).await?;
match req_body.as_bytes() {
Some(b) if !b.is_empty() => {
stream.send_data(Bytes::copy_from_slice(b)).await?;
}
_ => {}
}
stream.finish().await?;
let resp = stream.recv_response().await?;
let mut resp_body = Vec::new();
while let Some(chunk) = stream.recv_data().await? {
resp_body.extend(chunk.chunk())
}
Ok(resp.map(|_| HyperBody::from(resp_body)))
}
}
pub struct PoolConnection {
// This receives errors from polling h3 driver.
close_rx: Receiver<h3::Error>,
client: PoolClient,
idle_timeout: Instant,
}
impl PoolConnection {
pub fn new(client: PoolClient, close_rx: Receiver<h3::Error>) -> Self {
Self {
close_rx,
client,
idle_timeout: Instant::now(),
}
}
pub fn pool(&mut self) -> PoolClient {
self.idle_timeout = Instant::now();
self.client.clone()
}
pub fn is_invalid(&self) -> bool {
match self.close_rx.try_recv() {
Err(TryRecvError::Empty) => false,
Err(TryRecvError::Disconnected) => true,
Ok(_) => true,
}
}
}
pub(crate) fn extract_domain(uri: &mut Uri) -> Result<Key, Error> {
let uri_clone = uri.clone();
match (uri_clone.scheme(), uri_clone.authority()) {
(Some(scheme), Some(auth)) => Ok((scheme.clone(), auth.clone())),
_ => Err(Error::new(Kind::Request, None::<Error>)),
}
}
pub(crate) fn domain_as_uri((scheme, auth): Key) -> Uri {
http::uri::Builder::new()
.scheme(scheme)
.authority(auth)
.path_and_query("/")
.build()
.expect("domain is valid Uri")
}